[Snyk] Security upgrade python from 3.9-slim to 3.12.0b1-slim

[blackmoonfank]

This PR was automatically created by Snyk using the credentials of a real user.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• vote/Dockerfile

We recommend upgrading to python:3.12.0b1-slim, as this image has only 69 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	150	Information Exposure SNYK-DEBIAN12-GLIBC-1546991	No Known Exploit
	150	Uncontrolled Recursion SNYK-DEBIAN12-GLIBC-1547039	No Known Exploit
	150	Uncontrolled Recursion SNYK-DEBIAN12-GLIBC-1547069	No Known Exploit
	150	Use of Insufficiently Random Values SNYK-DEBIAN12-GLIBC-1547135	No Known Exploit
	571	CVE-2023-45853 SNYK-DEBIAN12-ZLIB-6008963	No Known Exploit

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